When viewing a user profile for a particular site there is a list of "Top Posts" followed by "Top Tags".
Clicking something in the lists of posts takes you to a post while the tags in "Top Tags" are not clickable.
The tags list on the web based version are clickable and take you to a list of questions with that tag.
Incase this does work on other devices. I am on a Nexus 5, 4.4.2